Caroline Dale, Marco Hietala, Tuomas Holopainen, Emppu Vuorinen, Floor Jansen, Andy Findon, Frank Ricotti, Dirk Campbell, Nicholas Bucknall, Troy Donockley, Kai Hahto, Chris Laurence, Skaila Kanga, Chris Tombling, John Anderson, Patrick Kiernan, Peter Lale, Helen Kamminga, Chris Worsey, Mike Lovatt, Martin Loveday, Heather Cairncross, Perry Montague‐Mason, Andy Wood, Robin Bailey, Steve Henderson, Mark Berrow, Paul Clarvis, Peter Hanson, Frank Schaefer, John Bradbury, Jenny O’Grady, Clio Gould, Warren Zielinski, Mary Carewe, Gary Kettel, Eleanor Meynell, Martin Owen, Michael Dore, Jonathan Williams, Jacqueline Barron, Tim Gill, Joanna Forbes, Andrew Busher, Kate Musker, Gerard O’Beirne, Claire Henry, Owen Slade, Ian McLarnon, Anna Noakes, Emlyn Singleton, Nigel Black, Dave Stewart, Andrew Crowley, Andrew Playfoot, Steve Morris, Helen Parker, Rita Manning, Alexandra Gibson, Daniel Bhattacharya, Gavin McNaughton, Kate Bishop, Lawrence White, Ann de Renais, Stacey Watton, John Mills, Kate Moore, Rachel Weston, David Fuest, Steve Mair, Ed Tarrant, Phillip Eastop, Emil Chakalov, Andy Parker, Lawrence Wallington, Peter Snipp, Soophia Foroughi, Tom Pearce, Helen Brooks, Sarah Ryan, Dai Emanuel, Julia Knight, Alice Fearn, Anne Marie Cullum, Caroline Fitzgerald, Davina Moon, Rosemary Forbes Butler, David Porter Thomas, Sebastian Charlesworth ont participé à l'enregistrement de Endlessness.